Thermostatic circuit-controller.



G. H. BOWEN.

THERMOSTATIC CIRCUIT CONTROLLER.

.PPLIQATION FILED .man no, 1901.

903,165. Patented Nov.1o,19oa.

f STATES I No. 903,165.

lo all whom-it may concern:

Be it known that I Geenen HQ Bowes, a citizen of the United States, residin in Boston, in the county of tu'ti'olk and lState of Massachusetts. have invented which the following description., injconiieetion withy the aecoinpiinyii'ig drawings, is a specification, like letters on re resenting like parts.

vice, 'which is protected lfrom external inpose, I eiiiplo an'inclo-singr tubepreferablyr of glass, within which the operative parts of iibl sealed against atmospheric influences, ant also protected from injury by external forces or devices. v

In tliepresent instance. the invention is and in accordance with this invenjin, the

tube, and which responds to exterpermit the movable member to make contact with the coip'feruting,r member or members and close the electric circuit.

The thermostatie circuit controller is especiacly designed and adapted to be employ in automatic' fire alarm service, among other uses.

These and other features of this invention will be pointed out in the claims at the end of this' specification.

Figure 1 is :in-elevation of a. tlierinostatic circuit controller embodying this invention. Fig. 2', a vert-ical longitudinal section of the circuit controller shown in Fig. t, the saine being shown in its open position. Fig. 3, a similar section of the circuit controller in its closed position,.and Fig. of the circuit controller shown in Fig. 1.

In the present instance I have shown'thc invention as embodied in an open circuit.,

thermostat, in which the movable mcnibcr is shown as a i'od u of silver or other good conductor of electricity, which cooperates witlil two fixed members l), c, here'in shown as hollow metal pieces having openings d through Specification of Lettefrs Patent. Appiimion mea :im 2o,.1 so1. serai No. 319395.

an Improvement in Therniostatic (firciiit-(lontrollers, of

the dri'iwings h is invention' relates vtqa tlierinostaticly circuit controller and' hasV for its object to provide' a simple, etliei'ent and reliable dei tluences, as will be described, fFor'this pnrthe circuit controller aie located and prefershown as'enibodied in :i thermostatic circuit i controller of the class used4 on open circuits,

nal lient of a predetermined degree so as' to'- 4, an inverted view t I11u/WENT OFFICE.

Geenen' n'. Bowex, or Bosrox, Mass-iciiesrrs, mancati-mc erneute-CONTROLLER.

Patented Nov. I0, 1908.

lwhich the ends of the ron c are extended. l 'the members Ii. rare secured as bv the bindg'ttig screws c, f to tcrinliial blocks or pieces f/L li, which arc tastcncd as blv the screws i', toga suitable base l 1 'lhe movable member n is-located in an t int-losing tube 1n, preferal'ily ot' Iglass, which i is titled over the tixcd members l. c and cxtcnded intosoclt'ctsI n in thc terminal blocks y, li. and is'rcinlertal air-tight o'r suhstant'ially so h v suitable cement, indicated by the heavy black liuc o. 'l`he movable member a l is normally held ont of engagement with the tixed members l), c by means of a slipport. of fusible material, such as fusible solder. which melts .at a lgiven or predetermined temperature. ln the present instance the support' for the'incmbcr n, is I shown as two disks y ot'substantially the internal diameter ot tht` tube nl., which are .strungi upon the rod u.

The t'usible support or disks 7i rest upon the tube m aiid normal'l)7 holdtbe rod out ot engagement with. tht` members 11.1', but u'lieii the temperature in the vicinity ot' thc circuit controller rcachcsa prciletcrmiucd poinhthe fusible support melts :unl allows thc rod n to dropand engage the mcnibcrs b. r. thereby by ,the

closing the circuit in which tbc circuit controllcr is included.

The. action ot* the thermostat may be quicltcned. by providing the rod or movable .iiicniber a. willi a weight l'. prct'crabl)r in thc forni 'of :i iiictal'sli-ci'c. which is preferably separated from the rod u by a sleeve or bushingr .s otl iioii-licat conducting material,

'so-:is toprei'ent. thc heat. in thc rod u being transmitted to thc metal weight c and thcreby tend to retard the transmission ol heat lil-'om onc't'usiblc dish y) to thc other.

'llic tube m. is preferably made. of glass So that the condition ot thc members of the .circuit controller may bc sccn at a glancel and thc. said tubc is prcl'crably protected from being broken, or accidentallyr painted or u'hitewashcd over, by a gnardor shield, which may bc iliade as a metal plate yw, which is secured to the terminal blocks g, li. by screws 7 or otherwise, aml which is pro. vided with slots or openings S for the passage' of heat.

ln o ici-ation, the movable. member or roda norma ly occupies the. posit ion shown in Fig. 2, but i'ben the lient in the vicinity of the thermostat ic circuit; cont roller, reaches n predetermined tenipcriiture, the fusible support'.

for the rod a melts, and permits the latter to drop down into engagement with thc fixed members b, c (see Fi 3) and thereby close thc circuit in which t ie circuit controller is located, such for instance as an automatic fire alarm circuit.

I have herein shownone construction of deviceembodyin this invention, but I do not desire to limit vmy invention to the particular construction shown.

I 'may prefer to 'ise the weight 1' but it may be -omitted, and the weight of the rodalone depended upon.

Cla uns- 1. The combination with," a` thermostati circuit controller comprising a movable rod movable in a direction transversel) of its length and circuit terminals with which it cooperates, o f an inclosing tube for said rod extended over said terminals, and 'a fusible suppoit for. said rod located in said tube and normallyengaging the inner surface of the same to hold the'said rod out of contact with said terminals, substantially as described.

2. The combination with a thermostatic circuit controller comprising a movable rod movable in a direction transversely of its length, and circuit. terminals with which itcoperates, of an inelosiug tiibe for said rod extended over saidlterminals, a fusible sul port for said iod ltwatcdin Said tube and normally engaging the inner surface of the latter to hold the said rod out of contact with said terminals, supports for Isaid circuit terminals, and a guard or shield for said tube secured to said supports, substantially as described.

3. 'lhe combination with a thermostat-ic circuit. controller com )rising a member and fixed members with which said movable. member cooperates and toward which said movable member moves in a direction substantially at right angles to the llength of said movable member, of an inclosing tn be for said movable member, anda fusible support for said movable member located -with'ni the tube and engaging its inner surface, substantially asI described.

4. ',lhe combination with a` thermostatie circuit controller provided with a movable member movablediia direction transversely moveable' y, of its length, of a tube inclosing said member, fusible material within said tube normally supporting said'movable member, and

circuit terminals with which said. movable member coperates, substantially as. de.-4

scribed.

5. The combination with a' thermostatic vcircuit controller provided with fixed mein' bers and with a movable member normally out of contact therewith and movable in a direction transversely ofits length, a fusible support for said movable member, and a glass tube inclosing' said movable member and sustainin said fusible support.

6. The conigbination with a' thermostatic circuit controller provided'with circuit `terminals, and with a movable member coper.. ating with said circuit terminals and movable transversely of its length, of a tubeiinclosing said movable membeigjfusiblejmaterial within said tube n'orinally sup orting said movable member, and means to c ose the ends of said tube, substantially as described.

i. The combination .with a thermostatic circuit controller provided with a movable member bodily movable in a d irectiontransf versely of its length, of a glass tube incl0sing said movable. member, fusible material supporting said movable member said tube, and circuit terminals extended into tliclo positel ends of said tube andwith which said'movnble member coperates, slib` stautially as described. i

S. The combination witlila thermostatic". 'circuit controller provided witha movable member movable'in a direction transversely y of its length, a tube inclosing s nid member, means to close theends of said tube, and tived 'teminal members carried by said means and coperating with said movable4 member.v and Yfusible material within the said l lube normally supporting said inember,l,sub I stantially as described. Y

In testimony whereof, I have signed my name to this specification inthe presenceof two `subscribing witnesses'.l l .h- GEORGE H.BOWEN. Witnesses: Jas. H. CHURCHILL,

J. MURPHY. 

